DESIGNING FROM ELEVATION AND PLAN 1. Elevation of left roof drawn to suit design with a temporary plan. 2. Misalignment of crossed diagonals indicates plan does not agree with elevation. 3. Elevation is held and plan is made to agree by constructing new diagonals. 4. Crossed diagonals of right roof and new plan do not align. 5. New plan is held and elevation of right roof is altered to agree. 6. Final step: Find true size and shape of each roof unit.